one man can do a piece of work in 4 hours; second and third together can do it in 3 hours, while first and third together can do it in 2 hours. How long will B alone take to do it?

A) 12

B) 14

C) 23

D) 34

first man 1 hours work = 1/4

secod + third 1 hours work = 1/3

first + thirsd 1 hours work = 1/2

first + second + third 1 hours work) = (1/4 + 1/3) = 7/12

second 1 hours work=(7/12 - 1/2)

= 1/12

second man work on 12 hours.

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